Please add the pattern /uvbview$ to the list of URLs that the PDA portal should pass through unchanged. This URL is created by the Ajax feature in RSF. As far as I can tell, all users of RSF's built-in Ajax support will match this pattern. Without this change, RSF's Ajax calls do not work when the PDA portal is in use. (More realistically, we have to ask all sites to add a property to sakai.properties.)
This is a problem for version 1.4 of Lesson Builder, but could come up in any tool using RSF. UVBProducer, which produces this URL, is referred to in Assignment 2, Evaluation, Gradebook, and Lesson Builder. However I haven't tested the applications other than Lesson Builder to see whether it's actually an issue and this pattern actually fixes them.
Since 2.8.1 is intended to be friendly to Lesson Builder, it would be useful to retrofit this to 2.8.1, as well as trunk and 2.9.